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Drug concentrations in plasma and urine were determined in 5 healthy subjects after intravenous infusion of 1 gm cephapirin and cephaloridine. Sampling of blood and urine was frequent and prolonged. Specimens were analyzed by high-pressure liquid chromatography (HPLC). Renal clearance of cephapirin decreased to less than 5% of control in all subjects when drug concentrations in plasma and urine declined. Cephaloridine clearance decreased to a lesser extent. Our findings suggest that, besides tubular secretion and glomerular filtration, a saturable and probably active tubular reabsorption is also involved in the renal handling of these two cephalosporins. The saturable reabsorption process was characterized by its Michaelis-Menten constant Km and its maximum transport capacity Tm.
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